Scatterplots and Trend Lines Review

What is the correlation between length of running start and distance of jump?

• positive:  the further you run the further you jump

• negative: the less you run the less distance of your jump

• positive: the further your running start the less your distance

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

Which line appears to fit the data better?

• line A

• line B

If m = -3/4 and b = 9, what is the equation of the trend line in y= mx + b?

• 0 = -3/4 (9) +9

• y = -3/4 x + 9

• y = -3/4 x - 9

• y = 3/4 + 9

The scatterplot shows the temp, in degrees, outside a house every hour for 10 hours.

Estimate the temp after 13 hours based off the trendline.

• 57.5

• 50

• 10

• 13

• 61.5

Sammy is selling his comic book collection on the internet. The scatterplot shows how many comic books he has left at the end of each day. Using the trend line, how many comic books should Sammy have left after 6 days?

• 15

• 10

• 30

• 8

Match the scatter plot to the equation that could represent the equation of its trend line.

• y = 3x

• y = x + 3

• y = -x + 5

• y = -5x

• The relationship is not linear

Sammy is selling his comic book collection on the internet. The scatterplot shows how many comic books he has left at the end of each day. Using the trend line, after how many days should Sammy predict to have 10 comic books left?

• 8

• 0

• 9

• 2

Using the ice cream sales scatter plot. Which of the following is true?

• The scatter plot shows no relationship between ice cream sales and temperature.

• The scatter plot shows during low temperatures there are high ice cream sales.

• The scatter plot shows ice cream sales are always equal no matter the temperature.

• The scatter plot shows during that usually during high temperatures there are high ice cream sales.

Which scatter plot could have a trend line whose equation is y hat= 3x + 10?

• A

• B

• C

• D